Environmental sealing is achieved through a combination of a tongue and groove construction and a preformed one-piece silicone rubber gasket; to ensure the integrity of the seal, the fixing screws are outside the gasket area.

Depending on the size, the lid is secured with two, four or six stainless-steel machine screws going into factory-tapped holes to aid repeated opening and closing; in six selected sizes with thicker lids, captive screws are used as an alternative.

The bases have raised lands to facilitate PCB or component mounting; interior space is maximised with smooth walls and a shallow draught angle.

For securely attaching the enclosures to a surface if required, through-box blind holes are provided outside the sealed area.